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ATK's Propulsion and Control System Supports Aegis Ballistic Missile Defense Flight Test Mission

 ATK's Propulsion and Control System Supports Aegis Ballistic Missile Defense
                             Flight Test Mission

ATK's Third Stage Rocket Motor (TSRM) Provides Critical Capability and Mission
Flexibility for the Standard Missile-3 Interceptor

ATK's Third Stage Rocket Motor Produced at Elkton, Md. Site

PR Newswire

ARLINGTON, Va., May 16, 2013

ARLINGTON, Va., May 16, 2013 /PRNewswire/ --ATK (NYSE: ATK), the nation's
leading solid rocket motor producer, provided critical components for the
recent successful Flight Test Mission–19 (FTM-19) missile defense test
involving a Standard Missile–3 (SM-3) Block IB guided missile. The SM-3 was
launched from a U.S. Navy Aegis Cruiser off the coast of Kauai, Hawaii.

ATK supplies the Third Stage Rocket Motor (TSRM) to Raytheon Company, the
prime contractor for the SM-3. Production of the TSRM occurs at ATK Defense
Group's location in Elkton, Md. The TSRM has a unique combination of
capabilities that permits the SM-3 guided missile to address a broad range of
threats as it intercepts and destroys the in-bound threat.

"The Aegis Ballistic Missile Defense System continues to demonstrate its
effectiveness against threat-representative targets," said Cary Ralston, vice
president and general manager of ATK's Missile Products division. "ATK is a
proud member of the SM-3 guided missile team, and this test provides
additional validation of the Block IB missile's production readiness."

ATK Defense Group is an industry leader in providing innovative and affordable
products across ammunition, precision and strike weapons, electronic warfare
systems, and missile components across air, sea, and land-based systems. ATK
is an aerospace, defense, and commercial products company with operations in
21 states, Puerto Rico, and internationally. News and information can be found
on the Internet at

Media Contact:               Investor Contact:
Bryan Kidder                Tom Sexton
Phone: 410-864-4932         Phone: 952-351-5597
Email: Email:


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